Observation of crossover from intraband to interband nonlinear terahertz optics

In this Letter, we investigate the nonlinear effects of extremely intense few-cycle terahertz (THz) pulses (generated from the organic crystal 4-NN, NN-dimethylamino-4^'4^'-N^'N^'-methyl-stilbazolium 2, 4, 6 trimethylbenzenesulfonate, with peak electrical fields of a few MV/cm) on the carrier dynamics in n-doped semiconductor thin film In_0.53Ga_0.47As. By performing open-aperture Z-scan measurements and recording the transmitted THz energy through semiconductor sample, we observed a strong THz absorption bleaching effect at high fields, followed by an absorption enhancement at even higher fields. We attribute our observations to a crossover from pure intraband carrier dynamics to an interplay between intraband carrier heating and interband carrier generations.

Regulation of Myocardial Extracellular Matrix Dynamic Changes in Myocardial Infarction and Postinfarct Remodeling

The article represents literature review dedicated to molecular and cellular mechanisms underlying clinical manifestations and outcomes of acute myocardial infarction. Extracellular matrix adaptive changes are described in detail as one of the most important factors contributing to healing of damaged myocardium and post-infarction cardiac remodeling. Extracellular matrix is reviewed as dynamic constantly remodeling structure that plays a pivotal role in myocardial repair. The role of matrix metalloproteinases and their tissue inhibitors in fragmentation and degradation of extracellular matrix as well as in myocardium healing is discussed. This review provides current information about fibroblasts activity, the role of growth factors, particularly transforming growth factor β and cardiotrophin-1, colony-stimulating factors, adipokines and gastrointestinal hormones, various matricellular proteins. In conclusion considering the fact that dynamic transformation of extracellular matrix after myocardial ischemic damage plays a pivotal role in myocardial infarction outcomes and prognosis, we suggest a high importance of further investigation of mechanisms underlying extracellular matrix remodeling and cell-matrix interactions in cardiovascular diseases.

Diffuse Axonal Injury: CT Findings and Clinical Profiles in Six Consecutive Cases

Diffuse axonal injury is a relatively rare type of brain trauma when prolonged coma with generally poor clinical outcome is often associated with negative neuroimaging findings. Although magnetic resonance imaging is the method of choice for evaluation of diffuse axonal injury, computed tomography still plays an important role as an emergency visualization modality. We compared computed tomography findings with clinical data, short and medium-term outcomes and, if available, autopsy results of six consecutive patients admitted to our hospital during the year of 2009. We found that corpus callosum lesions were most closely associated with diffuse axonal injury, followed by subdural hematoma or hygroma.

HEALTH IMPROVEMENT ACTIVITIES IN PRESCHOOL DAILY ROUTINE

Aim. The aim of this article is to develop and justify a complex of physical education and health improvement activities, including swimming, for 4–5-year-old children. Materials and methods. The study was conducted on the premises of “A” and “B” preschool establishments in Chelyabinsk. 44 boys and girls aged 4–5 years participated in the study. Children from kindergarten “A” were involved in swimming with a complex of additional health improvement activities, including sauna, phytotherapy, and cold exposure training. During the study, the following methods have been used: the analysis and synthesis of special and methodical literature, pedagogical observations, pedagogical experiment, control tests for swimming skills assessment, calculation methods, mathematical statistics. Results. The application of the complex proposed (sauna, cold exposure training, phytotherapy) in the experimental group decreased significantly children’s disease frequency by the end of the course. This proves a positive influence of the complex proposed on immunity in 4–5-year-old children in preschool establishments. Conclusion. Methodical peculiarities of a health improvement program influenced the level of children’s swimming skills. The analysis of disease frequency during a year allows us to suppose that the complex proposed influenced positively body resistance to unfavorable environmental conditions

Heart Failure And Type 2 Diabetes Mellitus: Neurohumoral, Histological And Molecular Interconnections

Heart failure (HF) is a global healthcare burden and a leading cause of morbidity and mortality worldwide. Type 2 diabetes mellitus (T2DM) appears to be one of the major risk factors that significantly worsen HF prognosis and increase the risk of fatal cardiovascular outcomes. Despite a great knowledge of pathophysiological mechanisms involved in HF development and progression, hospitalization rates in patients with HF and concomitant T2DM remain elevated. In this review, we discuss the complex interplay between systemic neurohumoral regulation and local cardiac mechanisms participating in myocardial remodeling and HF development in T2DM with special attention to cardiomyocyte energy metabolism, mitochondrial function and calcium metabolism, cardiomyocyte hypertrophy and death, extracellular matrix remodeling.

EFFECT OF POSTULAR BALANCE ON CHANGE IN HEART RHYTHM AND CONDUCTIVITY IN SWIMMERS

Aim. The purpose of the study is to predict the occurrence or reveal changes in the electrocardiogram (ECG) of swimmers with the help of stabilometric indicators. Materials and methods. Sixty qualified athletes participated in the study (CMS, MS, age 16–18 years). Bicycle ergometry was used to detect cardiac rhythm and conduction abnormalities, and a stabilometric complex was used to assess postural balance. Results. Incomplete right bundle branch block (RBBB) was observed in 53.33% of athletes; first-degree sinoatrial (SA) block – in 10.01%; extrasystoles (supraventricular: atrial, atrioventricular) – in 33.33%; pacemaker migrations – in 3.33%. Athletes in group 0 recorded a higher level of fluctuations in the center of pressure in the frontal plane in all tests (p ≤ 0.05): COP-RMSD in FP MS EO (> 132.32%), LHT (> 31.94%), RHT (> 76.82%), MS EC (> 83.56%), LHT EC (> 68.61%), RHT EC (> by 87.65%). Using Random Forest machine learning algorithm, it is possible to predict the occurrence or detect changes in the heart rhythm and conductivity in swimmers. Conclusion. The features of changes in the electrocardiogram of athletes were considered, the compared parameters of stabilometry data with and without ECG changes were significant at p < 0.05. A Random Forest model was created to predict or detect changes in the ECG of athletes with the help of stabilometric indicators.